Achieving TADF and RTP with Stimulus-Responsiveness and Tunability from Phenothiazine-Based Donor−Acceptor Molecules,Advanced Optical Materials

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Achieving TADF and RTP with Stimulus-Responsiveness and Tunability from Phenothiazine-Based Donor−Acceptor Molecules
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2023-08-12 , DOI: 10.1002/adom.202301215
Tianhang Song ₁ , Huilong Liu ₁ , Jun Ren ₁ , Zhongwen Wang ₁

Affiliation

Research of thermally activated delayed fluorescence (TADF) and room-temperature phosphorescence (RTP) materials is attractive owing to their extensive applications in various fields. However, achieving organic TADF and RTP materials, particularly those with stimulus-responsiveness and tunability, is highly desirable but challenging and rarely reported. Herein, two easily synthesized organic molecules are reported with abnormal stimulus-responsive switchable TADF and RTP effects, in which phenothiazine (PTZ) and benzo[b]phenothiazine (BPTZ) based donor−acceptor molecules PTZ-DBQ and BPTZ-DBQ show mechanical-induced TADF in crystalline phase and photo-responsive RTP in doping poly(methyl methacrylate) (PMMA) films. This is the first time tetracyclic BPTZ has been used as a donor in achieving TADF and RTP materials, and it is found that BPTZ-DBQ exhibits remarkably better photophysical properties than PTZ-DBQ. Systematic studies of experimental results and theoretical calculations indicate that the conformational heterogeneity plays an essential role in achieving mechanical-induced TADF with mechanochromic luminescence (MCL) property. Embedding the organic phosphors into rigid polymer matrices effectively suppresses the molecular motion, thus turning on the RTP emission channel. The conversion of ³O₂ to ¹O₂ under UV irradiation is mainly responsible for the photo-induced process. These multifunctional luminescent materials have great potential applications in chemical sensors, information encryption, and anti-counterfeiting.

中文翻译：

通过基于吩噻嗪的供体-受体分子的刺激响应性和可调性实现 TADF 和 RTP

热激活延迟荧光（TADF）和室温磷光（RTP）材料的研究因其在各个领域的广泛应用而备受关注。然而，获得有机 TADF 和 RTP 材料，特别是那些具有刺激响应性和可调性的材料，是非常理想的，但具有挑战性，而且很少报道。在此，报道了两种容易合成的有机分子具有异常的刺激响应性可切换TADF和RTP效应，其中吩噻嗪（PTZ）和苯并[b]吩噻嗪（BPTZ）基供体-受体分子PTZ-DBQ和BPTZ-DBQ表现出机械-在结晶相中诱导 TADF 并在掺杂聚甲基丙烯酸甲酯 (PMMA) 薄膜中诱导光响应 RTP。这是首次使用四环BPTZ作为供体来实现TADF和RTP材料，并且发现BPTZ-DBQ表现出比PTZ-DBQ明显更好的光物理性能。实验结果和理论计算的系统研究表明，构象异质性在实现具有机械致色发光（MCL）特性的机械诱导TADF中起着至关重要的作用。将有机磷光体嵌入刚性聚合物基质中可以有效抑制分子运动，从而打开RTP发射通道。^{在紫外线照射下3} O ₂转化为¹ O ₂是光诱导过程的主要原因。这些多功能发光材料在化学传感器、信息加密、防伪等方面具有巨大的潜在应用前景。

更新日期：2023-08-12

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